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2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.




All commands from sorted by
Terminal - All commands - 11,588 results
for i in * ; do cp $i $i.bak; done
2009-02-05 15:15:40
User: swinz
Functions: cp

quick in directory backup of all files in this directory. Adds the .bak extension to all copies.

head -c $((<pw-lenght>-2)) /dev/urandom | uuencode -m - | sed -e '1d' -e '3d' | sed -e 's/=.*$//g'
2009-03-24 20:05:16
User: P17
Functions: head sed uuencode

Replace < pw-length > with the desired password-length.

The password-length is not always correct, but wayne...

ifconfig | grep eth | awk '{print $5}'
2011-02-02 20:42:22
User: diacus
Functions: awk grep ifconfig

This command is useful when you want to check your nic's mac address, if you're interested in your wireless interface, use its ID instead "eth".

This command was tested under Ubuntu and Slackware GNU/Linux.

svn log -q | grep -v "^-" | cut -d "|" -f 2 | sort -u
find . -type f -print0 | xargs -0 chmod a-x
2012-06-11 07:28:30
User: jlaunay
Functions: chmod find xargs

Using xargs is usually much quicker as it does not have to execute chmod for every file

diff -qr <dir1> <dir2>
find . -type f -exec ls -s \{\} \; | sort -n
2010-06-02 11:03:31
User: Insti
Functions: find ls sort

Finds all files below the current directory.

Orders the result from smallest to largest.

Good for finding the largest files in the tree.

alias myip='curl -s www.wieistmeineip.de | egrep -o "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"'
egrep -i "somepattern" `find . -type f -print`
VAR="foo" ; awk '{ print '"$VAR"' }'
2011-04-15 07:56:20
User: FRUiT
Functions: awk
Tags: bash awk print

BASH: Print shell variable into AWK

kill -9 $$
2009-02-17 15:10:29
User: chanux
Functions: kill

Kill -9 immediately kills the given process number. $$ is the process ID of the process you are in.

sed -n '/jan\|Jan\|JAN\|JAn\|jAn\|jAN\|jaN/p' data.txt > jan-only-data.txt
du -shc .[^.]* * | grep [MG]
2010-07-06 10:13:18
User: rubo77
Functions: du grep

shows only folders, that are MB or GB in total size

links2 -dump http://checkip.dyndns.com| egrep -m1 -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
wget -O- -q http://www.nomachine.com/download-package.php?Prod_Id=2067 | sed -n -e 'H;${x;s/\n/ /g;p;}' | sed -e "s/[Hh][Rr][Ee][Ff]=\"/\n/g" | cut -d "\"" -f1 | sort -u | grep deb$
complete -W "$(echo `cat ~/.ssh/known_hosts | cut -f 1 -d ' ' | sed -e s/,.*//g | uniq | grep -v "\["`;)" ssh
alias ':q'='exit'; alias ':e'='vim';
2012-08-12 12:35:10
User: expelledboy
Functions: alias
Tags: vim alias

This was me just succumbing to the habits, but now I rarely use quit or vim directly, so beware! :)

ps -e | grep SearchStringHere
wget http://checkip.dyndns.org && clear && echo && echo My IP && egrep -o '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}' index.html && echo && rm index.html
pgrep <name>
2010-02-28 22:59:33
User: alesplin
Tags: grep ps

You'll need to install proctools. MacPorts and Fink have this if you're running Mac OS X, check your Linux distribution's repositories if it isn't installed by default.

kill -9 `ps -u user -o "pid="`
wget http://tools.web4host.net/versions.tmp --quiet -O - | grep PHPMYADMIN | sed 's/PHPMYADMIN=//' | cat
2011-09-22 04:11:44
User: wr8cr8
Functions: grep sed wget

This is to get the latest version of phpMyAdmin to support scripts to download the latest version of the software if they want to automatically update.

alias lso="sudo lsof -i -T -n"
2009-05-14 04:01:05
Functions: alias

list what applications using what ports

who -m | sed 's/.*(\(.*\)).*/\1/'
2011-09-22 10:28:30
User: keymon
Functions: sed who

Will print the host associated with the current stdin.

This is useful to set the DOIT_SERVER for the doit remote execution agent ( http://www.chiark.greenend.org.uk/~sgtatham/doit/ )

export DOIT_HOST=$(who -m | sed 's/.*(\(.*\)).*/\1/')

Note that SSH_CLIENT variable can be lost if you use su or sudo (if set to reset vars)

telnet <ip> <port>
2009-02-12 19:11:03
User: leprasmurf
Functions: telnet

Telnet will make a tcp connection to a remote ip/port to test connectivity. If it times out, it's not reaching the host (maybe the firewall is blocking it). If connection is refused, it's reaching the host, but either the service is not listening on that port, or it's locked.